public class Point3D {
    public float x, y, z;           // coordinate of vertex

    public Point3D() {
    }

    public Point3D(float xval, float yval, float zval) {
        x = xval;
        y = yval;
        z = zval;
    }

  public Point3D(Point3D copy) {
    x = copy.x;
    y = copy.y;
    z = copy.z;
  }

    public String toString() {
        return new String("Point3D is ["+x+", "+y+", "+z+"]");
    }
}